package 剑指offer;

public class 剑指Offer25合并两个排序的链表 {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        ListNode dummyHead = new ListNode(-1);
        ListNode cur = dummyHead;
        while(l1 != null && l2 != null){
            if(l1.val <= l2.val){
                cur.next = l1;
                l1 = l1.next;
            }else{
                cur.next = l2;
                l2 = l2.next;
            }
            cur = cur.next;
        }
        if(l1 == null){
            cur.next = l2;
        }
        if(l2 == null){
            cur.next = l1;
        }
        return dummyHead.next;
    }
}
